Comments on activators and spectra:

A specimen from the Nadym River area fluoresces red due to manganese activator. From Mont Saint-Hilaire, crystals have been found that fluoresce intense blue like that of Fluorite under SW, MW, and LW(Jacques Poulin). Also Green luminescence due to U impurities in this locality (pics around 525 nm). Activators: Mn2+ in the Ca position (orange luminescence peaking at 600-620 nm) and Mn2+ in the K position (green emission peaking at 500 nm) (tarashchan); also Ce3+ (343, and 365 nm)(Gaft)

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